Formation and Structure of Diffusional Zinc Coatings Formed in Nanocrystallized Zinc Powders

Abstract

The results of the studies of phase formation and the structural state of diffusional zinc coatings formed in zinc powder with nanocrystallized surface of the particles are presented. The sequence of iron-zinc phases formation during the process has been established, which is the reciprocal of those obtained during the annealing of "hot dip" coatings. The microstructure of δ-phase in the coating, a change in its texture and structural parameters through the thickness of the coating have been studied.

Corrosion of diffusion zinc coatings in sodium chloride solutions

“…In the previous works [17][18][19], the relationship between the coating thickness, phase and chemical composition of the surface layers is described in detail. The δ-phase (FeZn7-10) is present on the surface of the coatings with a thickness of 10 to 40 μm, and for the coatings with a thickness of 50 to 80 μm the ζ-phase (FeZn13) appears on the surface.…”

“…The galvanizing temperature was 450 °C, the duration was from 1 to 4 hours. The saturating mixture contained zinc particles with nanostructured oxide on the surface [15][16][17][18], which is a feature of the proprietary technology. The galvanizing technique is described in [15][16][17][18].…”

“…The saturating mixture contained zinc particles with nanostructured oxide on the surface [15][16][17][18], which is a feature of the proprietary technology. The galvanizing technique is described in [15][16][17][18]. The resulting coatings have a dark gray color and a uniform appearance.…”

Features of Technological Processes of Nanogalvanizing

“…Studies of the corrosion and mechanical properties of nanоgalvanized coatings have shown that the properties of coatings are determined by their composition and microstructure [8][9][10]. This article provides a comparative analysis of the technological capabilities of equipment to obtain the necessary corrosion and mechanical properties of diffusion zinc coatings based on structural studies of coatings obtained using various technological schemes.…”